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Old 03-06-2014, 08:40 PM   #1
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Door sensors to turn off heater when doors open (wiring)


I'm in the planning phase of my garage project and I'm thinking about installing door sensors on each garage door to turn off the heater when they are open.

I will have an electric heater which will be controlled by a low voltage digital thermostat via a 24V relay/transformer.

I'm not sure how to tie in the door sensors wire to the thermostat. See my wiring diagram below.



Thanks in advance

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Old 03-06-2014, 08:44 PM   #2
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Door sensors to turn off heater when doors open (wiring)


Wire the sensors in series with the W circuit

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Old 03-06-2014, 08:49 PM   #3
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Door sensors to turn off heater when doors open (wiring)


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Originally Posted by hvactech126 View Post
Wire the sensors in series with the W circuit
Thanks for the quick response. So both wires from the last sensor should be wired to the W terminal on the thermostat.

Best technique would be to put both sensor wires into a marrette connector along with another wire that would go into the W terminal of the thermostat ? Am I right ?
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Old 03-06-2014, 08:58 PM   #4
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Door sensors to turn off heater when doors open (wiring)


each sensor has 2 wires correct? If so, the wires would break the W circuit.
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Last edited by hvactech126; 03-06-2014 at 09:12 PM.
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Old 03-06-2014, 09:02 PM   #5
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Door sensors to turn off heater when doors open (wiring)


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Originally Posted by hvactech126 View Post
each sensor has 2 wires correct? If so, the wires would break the W circuit.
Yes, they have two wires.
Like this one
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Old 03-06-2014, 09:14 PM   #6
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Door sensors to turn off heater when doors open (wiring)


see my edited post #4
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Old 03-06-2014, 09:26 PM   #7
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Door sensors to turn off heater when doors open (wiring)


You would install the switches in series with each other. This would allow either one or both opened doors to turn off the heater.

Disconnect the w wire from the thermostat and connect it to one of the wires on sensor 1. Take the other wire from that sensor 1 and connect it to a wire on sensor 2. Take the second wire from sensor 2 and connect it to the w contact on the thermostat.

I'm assuming these sensors are the normally open type? (They make contact when the magnet is near to it). This being the case then line the switch up with the magnet when the door is in the closed position.

Last edited by Bob Sanders; 03-06-2014 at 09:29 PM.
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Old 03-06-2014, 09:35 PM   #8
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Door sensors to turn off heater when doors open (wiring)


Thanks again ! With you wiring diagram, if only one door is open, will it shut off the heater ?
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see my edited post #4
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Old 03-06-2014, 09:38 PM   #9
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Door sensors to turn off heater when doors open (wiring)


switches need to be in series.... mount a utility box between the doors ceiling high. run a 2 wire bell stat wire to that utility box from the stat...run both switches to the box..connect 2 switch wires together wire nut(they are in series now)connect the remaining door switch wire to the bell stat wires "one each" wire nut....now at the stat remove the W wire ...nut it onto a bell wire and the other bell wire to the W terminal...your done
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Old 03-06-2014, 09:39 PM   #10
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Door sensors to turn off heater when doors open (wiring)


Taken from your diagram there was only 1 door/sensor... so add another in the same manner and it will work as you like.
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Old 03-06-2014, 10:54 PM   #11
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Door sensors to turn off heater when doors open (wiring)


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Thanks again ! With you wiring diagram, if only one door is open, will it shut off the heater ?
Yes. One or the other, or both
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Old 03-07-2014, 08:27 AM   #12
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Door sensors to turn off heater when doors open (wiring)


Thanks to everyone for your help.

My plan is to mount the thermostat on a single gang (utility) box so I would use the utility box to do all the wire connections inside.

Would it be possible to confirm if the diagram below is ok (please note that I didn't wire the C and R terminal in my diagram) ?
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Old 03-07-2014, 08:56 AM   #13
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Door sensors to turn off heater when doors open (wiring)


Are these switches the same as they use for house alarm systems? Are they an actual switch (snap action switch) and will not reduce ANY voltage? If they are proximity sensors meant for alarms and drop any voltage to the W of the furnace then it can get damaged. I would want a switch that operates a relay (Honeywell R8222 D or K relay) that has a normally open contact and put your W wiring thru that contact.

Basically you get a extra 20 VA 24 volt transformer and run power to those sensors and operate the R8222D relay with them. run your W wire thru the normally open contacts on the relay and it is safe.
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Last edited by yuri; 03-07-2014 at 09:03 AM.
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Old 03-07-2014, 09:39 AM   #14
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Door sensors to turn off heater when doors open (wiring)


Yuri
I was thinking about going with a garage door sensor like this one:
http://www.seco-larm.com/pdfs/PI-SM-226LR-3.pdf
It's considered a switch; only on and off are possible.


Quote:
Originally Posted by yuri View Post
Are these switches the same as they use for house alarm systems? Are they an actual switch (snap action switch) and will not reduce ANY voltage? If they are proximity sensors meant for alarms and drop any voltage to the W of the furnace then it can get damaged. I would want a switch that operates a relay (Honeywell R8222 D or K relay) that has a normally open contact and put your W wiring thru that contact.

Basically you get a extra 20 VA 24 volt transformer and run power to those sensors and operate the R8222D relay with them. run your W wire thru the normally open contacts on the relay and it is safe.
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Old 03-07-2014, 10:02 AM   #15
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Door sensors to turn off heater when doors open (wiring)


I did this in my shop years ago.

I used a simple and cheap micro switch that has a short spring lever. The switch is mounted on a bracket fastened to the track and I fabricated a simple arm on the door to trip the switch. When the door is completely shut the normally open/common terminals close allowing the heater to run. I used the wire from these two terminals to interrupt the signal from the thermostat. It's mounted up high just below the curve track so it wouldn't get bumped. Decided to install this after I got home one morning from working the night shift to find my door standing open at -15. Installed almost 20 years ago and it still works perfectly.

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